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I am a high school teacher and I found a beautiful commercially produced Turquoise glaze that tends to run, a lot! I have never relly gotten in to the chemistry of glazes. I have always used prepared commercial glazes. Simple, easy to mix and cheap. My question is, what can I add to the glaze to reduce the amount of running? I believe that the running is a result of firing the glaze to too high of a temp. However, if I fire to a lower temp to keep the Turquoise from running, the other colors will not fully mature. With so many students, I don't have the capacity to do a firing of just the Turquoise glazed projects. My little research says that by adding China Clay to the glaze it will reduce the runnyness (not sure if that's a word). I also saw that Spodumene will raise the melting temp as well. Any help is greatly apprecioated. Brian